FR2684042A1 - BAND COMMITMENT DEVICE FOR A PRESS PRESS WITH A COIL. - Google Patents

Abstract

A web-engaging device for a web printing press consisting of a preferably square guide piece, a roughly C-shaped guide channel and motor stations for the reel printing press according to the invention. movement of the guide piece, the C-channel serving to house and guide the guide piece and being placed on the press frame between the motor stations, the guide piece being slightly longer than the distance between the different stations engine, the advancement of the guide piece is caused by the movement of a slide, fitted with jam rollers which, alternately, clamp and release the guide piece. According to the invention, said band engagement device consists of a pair of jam rollers preventing the return movement of the guide piece. Application to the introduction of strips of paper unwinding continuously in a reel printing press.

Description

i Reel printing presses, whatever the printing process

  employee, print on a continuous strip of paper unwound from a reel. These presses generally consist of the following items: Reel Dispenser which delivers a tape of

paper at a regulated voltage.

  Debtor which increases the paper tension supplied by the unwinder and improves the tension regulation. Printing groups that file on paper in so-called "printer" areas, films

ink of various colors.

  Hot air dryer which, by blowing air

hot, dry the ink film.

  Coolers that bring back the paper to the

  room temperature, when leaving the dryer.

  Paper path that cuts the various tapes into ribbons, overlaps them with the help of rollover bars and puts them in phase to match the pages of

  various ribbons using cutting registers.

  Folder or flat exit which cuts the continuous band which arrives to him and possibly folds it for

constitute a folded fascicle.

  These various devices comprise a large number of free or driven rollers, on which the band in

  scrolling passes and changes direction.

  Before putting the printing press into operation, it is necessary to "engage" the band between or around

various rollers.

  This operation was done, in the past,

traditionally handmade.

  Several operators moving around the machine were passing the end of the strip of paper to each other, after cutting this tip end, to facilitate engagement between

the various pairs of rollers.

  Indeed, and this is the case for a printing group for example, many rollers or cylinders participating in the printing process are arranged in pairs, their axes being parallel to each other and lying

  on both sides of the strip.

  The process of manual engagement of the belt is long, painful because it is necessary to climb into the structure of the machine to engage the tape on the paper rolls and would be dangerous if the various couples of engaging rolls were unprotected by

"Finger guard".

  It should also be noted that on most

  printing presses, the paper path is not unique.

  Depending on the desired end product, you can borrow different paper paths, so pass on

  the various rolls, in a different order.

  A better engagement system known as "engagement cords" has long been known. This system consists in arranging, at the end of the various rollers, crazy pulleys on which circulates an endless belt which traverses the most

often borrowed by the paper.

  Arrived at the end of its course, this cord must return to its starting point on a series of so-called return pulleys must also provide for tensioning devices to maintain this belt, a tension

  suitable and a driving device for driving the en-

seems of the system.

  To engage the paper, cut it at an angle

  to make a point, on the side where is the cord of engagement, one hangs this point with the cord of engagement-

  the press and the motor system of the cords, so that the paper is driven by

these, from roll to roll.

  This system generally gives satisfaction, especially on the presses to print the daily newspapers. It should be noted, however, that the course of the cord is unique and invariable and that it does not allow

  to make several paper passages to choose from.

  Sometimes it is possible, it is true, to have several cords, for example one on each side of the width of the paper to be engaged, these cords realizing

  the following commitment of different paths.

  We can also, in this case, secure the paper on a certain length, with one of the cords

  and on another part of the way with the other cord.

  Note, however, that this solution is no longer fully automatic and requires intervention

important staff.

  Other engagement systems are known in which a bar crosses the width of the width, being bonded on both sides thereof to chains or cables driven in synchronism by a winch located in

end of the machine.

  The chains or cables pass, in this case, on pulleys whose axes are fixed on both sides of the

machine frames.

  To engage the band, we fix its end to the engagement bar, using tape and put

  in slow running the printing press and the winch.

  The engagement bar moves along the path of the chains or cables and introduces the strip along this path Sometimes this system is "endless": the chains or cables being continuous and having a loop path. In other systems, there is near the unwinder, a winch chain or cable "wire feeder" and A

  near the folder a winch "winder".

  When the belt has been engaged, the bar of the chain or cable drive system is disengaged and

  the chain or cable is rewound on the winch

  Here again, the main disadvantage of this system is that it allows the paper to be

a unique course.

  Systems have been proposed in which a length of roller chain, only a few meters long, moves in a fixed channel against the

frame of the machine.

  This channel has an 'IC' section, so that

  the chain is trapped in the canal.

  At the rear of the chain section, a hook exits through the opening of the channel, serving for the attachment of the

  tip formed in the paper strip to engage.

  The chain is, of course, arranged in the channel, so that its rollers and thus its axes of articulation are parallel to the axes of the rollers and

cylinders of the press.

  To drive this chain, along the channel, are fixed station, electric or pneumatic motors driving chain sprockets whose axes are also parallel to the axes of the rollers of the press. These chain sprockets mesh with the chain, through slots made at fixed intervals

  in the wall of the channel guide channel.

  It is arranged that the distance, along the channel, between two chain wheels, is less than the length of the chain section, so that this section is pushed into the channel, to the next gear

  who will then mesh with him and shoot him.

  Chain presence detectors, electrical

  or tires are used to start and stop

  engines that only work when a chain passes through them.

  This system has the advantage over previous ones to allow

  the commitment of the band on varied courses.

  It is indeed possible to have the switches on the channels between the various sections and send the chain on different paths. The object of the invention described herein is to provide a tape engagement system which combines the advantages of the possibility of engaging the tape on various paths using turnouts. Ability to dose the tensile force on the belt while having a very low intertie, avoiding paper breakages in case of

  momentary slowing of the band.

  Possibility to make the advance of the belt proportional to the machine speed and to be able to regulate independently, on each

  training area, this proportionality factor.

  Possibility of having a two-way workout

  walk (front or rear) without acting on any motor.

  Ease of making plan changes, that is, of

  vary the distance between the axis of the strip and the device

  ment. Obtaining a simple and economical system to build whose control is only by a supply of compressed air and two electrical son bringing together, all the "motor stations". The system consists mainly of the following elements * A "snake", a piece of semi-rigid plastic guide,

  round or square section, about 2 m long.

  * A guide channel, C-shaped metal profile, inside which moves the snake This channel is fixed to the frame of the

  press, from one side of the strip and parallel to it.

  * A plurality of identical "motor stations" located along

  of the canal and propelling the "snake" inside them.

  Various other features of the invention as well as its

  operation are apparent from the following description made with reference to

attached drawings.

  The "snake" is shown in FIG. 1, it is a flexible plastic section having, preferably, a square section of 7 mm by 7 mm and whose front portion 2 is tapered in the manner of the tip of FIG. a needle, so as not to get stuck in the discontinuities of the canal,

when the snake progresses.

  The rear portion 3 is slotted in the middle on a few centimeters in length and a piece 4 in foil (spring steel) a few tenths of a millimeter thick is fixed in this slot by

rivets 5.

  This piece 4 is provided with an orifice 6 in which will be fixed

  the point made on the strip of paper to engage.

  It should be noted that advantageously the guide piece is

flexible.

  Figure 2 shows the guide channel.

  It consists of a metal section 20 (made of aluminum spun for example) of square section, 8 x 8 mm, open C-shaped, in the middle of one of its sides This metal section 20 is held at a constant distance of the frame of the press 23, by spacers 21, glued to the profile

  20 and fixed on the frame 23 by screws 22.

  The "motor station" is the most complex part of the system, it has

  for the purpose of propelling the "snake" inside the "channel".

  Figure 3 shows this motor station in elevation and the figure

  4, the same motor station in top view.

  The following description refers to Figures 3 and 4.

  The body of the "engine station" is constituted by a plastic plate 30, of relatively complex shape and provided in its rear face, with a guide groove 31, extending over the entire length of the plate 30. In this guide groove, a metal tongue 32 is housed and can slide smoothly. This piece 32 is provided with one of its

  ends of a square 33, pierced with a hole.

  A pneumatic jack 34 is fixed by

  brackets 35 and 36 on the plate 30.

  The rod of this cylinder 37, receives at the end a screw 38 which passes into the hole of the bracket 33 and secures

  thus this rod with the tongue 32.

  At the front of the plate 30, a rectangular cavity

  gullet 39 houses a slide 40, fixed by two screws to the

tongue 32.

  This slider houses two jamming rollers 42 and 42 ', each provided with an eccentric hinge pin 43 and 43', which are housed in drilled bores.

in the slider 40.

  The jamming rollers 42 and 42 'each carry holes 44 and 44' in their trunnion 43 and 43 '. A piece of piano wire 45, connecting the two holes 44 and 44' tends to return the clutch rollers to a position

intermediate constant.

  Thus, the two jamming rollers 42 and 42 'are brought back to a constant position which happens to be that in which their cylindrical parts are

  facing each other, are brought closer together.

  In the absence of the "snake" 1, the cylindrical parts of these jamming rollers define a space

  less than the width of the "snake".

  When the "snake" is introduced between the jammer rollers, it spreads them with the help of its tapered pyramidal portion and is stuck in one direction: it can progress in the sense that it has been introduced, but

is blocked in the opposite direction.

  This, however, whatever the direction in which it was introduced: that this is in the sense

  shown in Figure 3 or in opposite directions.

  The "engine station" further comprises two other jamming rollers 46 and 46 'absolutely identical to the rollers 42 and 42', also journalled on eccentric pins 47 and 47 'and biased in the middle position by

the piano wire 48.

  These jamming rollers 46 and 46 'are articulated directly on the frame 30 of the "station

engine".

  A stop screw 49 immobilized by a counter

  nut 50 limits the stroke of the slide 40 under the action

  of the jack 34, and allows the adjustment of this stroke.

  The motor station is furthermore equipped with an electric switch 51 which closes a normally open contact when its wheel 52 comes into contact with the

"snake" 1.

  This switch is connected by a terminal block 53 to the general electrical circuit of the system which will be described

later.

  Similarly, a solenoid valve 54, of the type 5/2 is

  attached to the rear of the "engine station" on frame 30.

  Figure 5 shows the pneumatic diagram of the installation. In this diagram, only 3 motor stations have been represented, bearing the reference numbers 100, 101 and 102. It is understood that the system may comprise any number of stations, this being dependent on the

  length and complexity of the journey.

  Note that each engine station, 101 for example, is composed on the pneumatic plane of a

  electrically operated 5/2 solenoid valve with spring return.

  This solenoid valve 54 'is connected by two pipes to the cylinder 34' of the engine station. All solenoid valves are supplied with parallel air

  tablet at 7 bar, from the press supply network.

  It is possible to adjust this general pressure to a level lower than 7 bar, using a single regulator to limit the force of

  pulling the system and thus avoid breaking the paper.

  Thus, when the current will be sent in a solenoid valve 54 'for example, the rod of the jack 34' will move from right to left and perform

  the reverse movement when the air will be cut off.

  Figure 6 shows an electrical diagram of the installation.

  In this diagram, three motor stations have been represented, it being understood that in a real installation, any number of stations

motor can be used.

  The motor stations are marked 100, 101 and 102.

  Each includes in series, the electric switch 51 and

the solenoid valve 54.

  The various motor stations 100, 101 and 102 are connected in parallel with each other and are powered by a 24 V DC network. This circuit is interrupted by a switch 103 controlled by a gear cam 104 which is wedged directly on one of the cylinders of

the printing press.

  The operation of the system is as follows. The toothed cam 104, driven by the printing press, is designed so that it provides a pulse, for example every 40 mm.

of paper, on the switch 103.

  If one of the switches 51 is closed, because the "snake" is in front of its pallet, the corresponding solenoid valve 54 will be excited and de-energized at the rate of advance of the paper, that is to say all the 40 mm of paper. Consider, for example, that the snake is in the engine station 101, the contact 51 'being alone closed, only the solenoid valve 54' will be actuated and will send air alternately from one side and the other of the cylinder piston 34 ', each time the paper advances by mm. The stroke of these rounds of the piston goes

  lead to and from the slide 40.

  It is possible, with the aid of the stop screw 49, to adjust the travel of the slide, in the vicinity of

mm or slightly more or less.

  As with each stroke of the piston, the jamming rollers 42 and 42 'join the snake in one direction with the slider and let it slide in the other direction, the snake advances by an amount equal to the stroke of the slider. The fixed jammer rollers 46 and 46 'act as ratchets and prevent a return of the snake. FIGS. 3 and 4 show that the C-section guide tube 20 inside which the snake moves is interrupted, at the level of a motor station, the ends of these tubes being introduced into

  milled cavities at both ends of the engine station.

  Thus, the guide of the snake during the crossing of the engine station is provided by a groove

dug into it.

  In addition, two sheet metal plates 55 and 56 partially close this groove and prevent the

  snake out, on the front of the device.

  These plates are fixed on the frame 30 of the 1 l

station by screws 57 and 58.

  According to the electrical installation represented by the diagram of FIG. 6, the snake 1 advances in successive jumps of 40 mm in a discontinuous manner. Indeed, in this case, the snake 1 has a length slightly greater than the greatest distance between two motor stations so that said snake is always at least actuated by a motor station, and sometimes simultaneously by two motor stations, being understood that the sliders of the various active motor stations have a synchronous movement. As a result, when the contact 103 is closed, all the slides 40 of the active motor stations move from left to right by 40 mm simultaneously and the snake with them. When the contact 103 is open, the slides 40 move from right to left. to return to position

  initial and the snake remains motionless.

  The advance of the snake 1 is discontinuous in successive jumps of mm. A variant of the circuit diagram of FIG. 6 is represented by

  the electrical diagram of Figure 6a.

  As can be seen in FIG. 6a, the even numbered motor stations 100, 102 in parallel are powered by a wire and the odd-numbered motor stations 101 are supplied by another wire In addition, the contact 103 has been provided. inverter, that is to say that when the paired power stations are powered, the odd stations are not

and vice versa.

  Thus the electrical installation represented by FIG.

continuous advancement of the snake 1.

  In this case, it is particularly recommended that the length of the snake 1 be equal to at least twice the maximum distance between two motor stations. As a result, the snake 1 is therefore at least engaged in 2 motor stations simultaneously and at the maximum engaged in 3 motor stations. When the contact 103 is closed, for example, for the supply of the paired motor stations, the corresponding slides 40 move to the right and the snake with them, while the circuit of the odd stations being open, the corresponding slides 40 move to the left, to the starting position As a result, the contact 103 reverses and

  then powers the odd stations, the even stations remaining inactive.

  As a result, the alternating movement of the slides of the even stations and the odd stations allows a continuous progression to the right of the

  snake 1 and the strip of paper to engage.

  It is conceivable that it is possible, in such a circuit, to have switches, active or inactive, allowing to choose between several paths

possible from the band.

  More particularly, return loops or stationary return stations are provided to automatically return the guide piece to its initial position. These return loops are also called idle switches. Figure 7 represents an inactive switch, which makes it possible to return the snake to its starting point, without any

intervention.

  The system comprises a motor station 150, located at the end of a tape engagement path. The snake arrives at station 150 in the direction of the arrow. This station will push it towards the idle switch 151 o, made of its tapered shape, it will engage either in one channel or the other and reach the station 152 which will start, because of its switch and will push the snake until that it returns by the other channel, points forward to the station 150, in which it is in opposite direction to the arrow f It goes then

  go all the way back.

  It does not matter whether the snake originally took one of the canals or the other, anyway, it will come back through the opposite channel to the

station 150.

  On the other hand, as best shown in Figure 8, the path of the guide piece called "snake" can be modified by means of

  active referrals o known referral stations.

  This system allows, of course, all kinds of active switches of a known type, for example by substituting one path for another, using slides dug in blocks of plastic material.

  Figure 8 shows such an active switch.

  This switch allows you to choose a route by positioning,

  in advance, a plastic block 200, using a pneumatic cylinder 201.

  The plastic block 200 slides in a fixed part, also of plastic 202 and which has forms 203 and 204 serving as stops for the block 200 which, therefore, can occupy only two positions,

depending on whether the cylinder is pushing or pulling.

  When the cylinder pulls the block down, the channels 205 and 206

  communicate through the groove 208, dug in the block 200.

  When the cylinder pushes the block upwards, the channels 205 and 207

  communicate through the groove 209, dug in the block 200.

  210, 211 and 212 are motor stations.

  In this way, a large number of referrals can be conceived on the

journey of the snake.

  The strip of paper can be pulled from one side of the machine frame, by punching in the paper, asymmetric: the tape engagement system only exists on one side and the tape is hooked in the hole 6 made in the foil 4, at the rear of the snake, to

  using adhesive tape (see Figure 1).

  A preferable solution is to provide a tape engagement system on the function side frame and a similar one on the side frame.

  the two systems facing each other (see Figure 9).

  Each system is then equipped with its snake, the two snakes being united by a wire which pulls the band on which a tip has been made

in the middle.

  In FIG. 9, 250 is the control side frame and 251 the function side frame 252, 253, 254 and 255 are motor stations, 256 and 257 are

  respectively the guide ducts control side and function side.

  258 and 259 are the hooking loops formed at the rear of the two snakes, while 260 is a textile thread connecting these two loops, 261 is the band to be engaged, in the middle of which has been made an engagement point 262 This tip is bent on the wire and attached to the tape using tape

adhesive 263.

  This system has the advantage of pulling the band by its middle and symmetrically. To ensure the synchronism of the two snakes, two systems are used The first system is to adjust the screws 49 of the various stations

  motor (Figures 3 and 4), to achieve synchronism.

  The second system consists of electrically coupling the command and control-side engine stations so that the first snake

  arrives at a station "waited" on the other side.

  Figure 10 is an electrical diagram for solving this

problem.

  This scheme replaces in this case that of Figure 6 or Figure

6 bis.

  The 24 volts DC is still chopped by the system linked to the cylinder of the machine: cam 104 and switch 103 This chopped voltage supplies the coils of the solenoid valves on the control side 301 and side

function 302.

  Contacts 303 and 304 are placed on this circuit and controlled by the relays 305 and 306, these relays being self-powered by their contacts 307.

and 308.

  The switches that detect the presence of the snake on the control side are equipped with two contacts 309 and 310, and even those that detect the

  presence of the function-side snake are provided with contacts 311 and 312.

  It can be seen that, after a stop, the two contacts 303 and 304 will only close if the switches of the two motor stations (control and

  function) simultaneously detect a snake.

  However, stopping the power station on one side will only be

  when the snake on that side has left its engine station.

Claims (11)

  A tape-engaging system for a web-based printing press, characterized in that a preferably square guide piece, a roughly C-shaped guide channel and motor stations for the displacement of the web are provided. guide piece, the C-channel serving to house and guide the guide piece and being placed on the frame of the press between the engine stations, the guide piece being slightly longer than the distance between the different engine stations and that the advancement of the guide piece is caused by the displacement of a slide, provided with jamming rollers which, alternatively, pinch and release the piece guidance.   2 tape engagement system according to claim 1, characterized in that a pair of jamming rollers prevents the movement back of the guide piece.   3 tape engagement system according to claims 1 and 2,   characterized in that the reciprocating movement of the slider in the engine station is caused by a pneumatic cylinder, also attached to the engine station and powered by a solenoid valve.   also attached to the motor station.   4 tape engagement system according to claims 1 to 3,   characterized in that a limit switch detects the presence of the guide piece and allows the supply of the solenoid valve of the engine station.   A tape engagement system according to any one of   Claims 1 to 4, characterized in that the electrical pulses   sent to the various motor stations, are generated by the rotation of the press which drives a cam acting on a limit switch which generates a number of pulses proportional to the rotation of the press. 6 tape engagement system according to any one of   Claims 1 to 5, characterized in that each motor station is   reversible, that is to say, advances the guide piece in one direction, whatever that meaning is.   7 Tape engagement system according to any one of   Claims 1 to 6, characterized in that the path of the guide piece   can be modified through active switches or referral stations of known type.   8 Tape engagement system according to any one of   Claims 1 to 7, characterized in that return loops or   fixed return stations are provided to automatically restore the   guide piece in its initial position.   9 Tape engagement system according to any one of   Claims 1 to 8, characterized in that the paper web can be   pulled by a wire interconnecting identical systems, located opposite the two machine frames (control side and function side), the   strip of paper being tied to this thread, in the middle.   Tape-engaging system according to claim 9, characterized in that an electrical device is provided for synchronizing the guide pieces on one side or the other of the paper web. Band according to Claim 1,   characterized in that the guide piece is flexible.   12 Tape engagement system according to any one of   Claims 1 to 8, characterized in that the reference motor stations   pair are interconnected by a power line, while the odd-numbered motor stations are also interconnected by another power line.   13 tape engagement system according to claim 12, characterized in that the power supply of these two lines is provided by an inverter contact, actuated by the rotation of the press, so that the motor stations with even reference and the odd-referenced motor stations are alternately supplied with voltage and in that this arrangement, in connection with the flexible guide piece slightly longer than twice the distance separating two motor stations, allows a quasi-continuous movement of the guide piece.   flexible and paper tape to engage. 17 2684042   14 A tape engagement system according to any of the claims   9 to 13, characterized in that the electrical supply circuit of the solenoid valves is designed so that the two flexible guide pieces are simultaneously set in motion, when both have arrived at the corresponding motor stations, while at the same time stop the forward movement of a motor station is transmitted to a room of   flexible guidance, even if the other part is already stopped.